Replacement Leaf Springs for a 2021 Grand Design Momentum 320G
Updated 12/01/2025 | Published 10/29/2025
Question:
I am thinking about putting 8k springs on my 2021 Grand Design Momentum 320G. I was hoping you could provide the proper part number and spring dimensions to me along with the numbers for bronze bushings and wet bolt kit. Thanks in advance!
asked by: James K
Expert Reply:
Hey Jim. I do not have a way of looking up what size springs are on your 2021 Grand Design Momentum 320G and Grand Design's parts database does not list what leaf springs your trailer has.
Without a part number the only way to find the right replacement springs are to measure one of your current ones. You will want to take a measurement from the center of the spring eye to the center pin on the leaf spring along the curve( measurement B in that attached image). This measurement will be the same no matter how worn the spring has become, it is the best way to measure for a replacement.
To find the correct wet bolt kit, I'll need to know how wide your shackle straps are. You'll want to measure from the center to the center of the mounting holes.
You can add this information and any other questions you have where it says Reply to Jerred H and I'll be happy to answer them.
(click to enlarge)
Product Page this Question was Asked From
etrailer Rubber Hitch Cover for 2" Trailer Hitches - Qty 1
- Hitch Covers
- Misc Covers
- Plain
- Rubber
- Fits 2 Inch Hitch
- Standard
- Square
- etrailer
more information >
Continue Researching
- Q&A: Stealth Hitch that Fits 2024 Ford Mustang Mach-E
- Q&A: Why Does the etrailer Trailer Hitch part # e72AR Have a Higher Towing Capacity than the Vehicle?
- Q&A: Best Replacement For Older Dometic Duo Therm 57915.531 Ducted Single Zone AC System With Furnace
- Q&A: Does Roadmaster Invisibrake System Require Installing Diodes too
- Q&A: Replacement Air Conditioner for a Dometic Duo Therm 600315.331
- Q&A: Recommended Replacement AC for a Dometic 57915541
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: What Air Conditioner 13,500 BTU Will Replace My Current Dometic Air Conditioner?
- Article: How to Clean Weld Nuts for the Installation of a Trailer Hitch | etrailer.com
- Article: How to Measure for Trailer Hitch Drop
- Article: Wiring Trailer Lights with a 4-Way Plug (It's Easier Than You Think)
- Article: 2 Steps for Finding the Right Weight Distribution Hitch Size
- Article: Trailer Wiring Diagrams
- Article: How to Choose the Right Trailer Hitch Class
Jerred H.
12/1/2025
Hey Jim, were you able to get those measurements for your leaf springs and shackle straps on the Momentum 320G? Once you have them, I can help you find the right springs and wet bolt kit. Let me know what you find—I'm here if you need a hand narrowing it down.